CN115964963A - Method and system for online monitoring of flow channel blockage of regulating valve - Google Patents
Method and system for online monitoring of flow channel blockage of regulating valve Download PDFInfo
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Abstract
The invention discloses an on-line monitoring method and a system for the blockage of a flow passage of a regulating valve, wherein the method comprises the following steps: collecting upstream pressure, downstream pressure, fluid medium flow, fluid medium temperature and actual valve opening of the regulating valve in an online operation state of the regulating valve; calculating to obtain the required flow capacity under the current working condition according to a flow equation based on the acquired data, and obtaining the theoretical opening degree of the valve of the regulating valve by combining with the flow characteristic curve of the regulating valve; and comparing the theoretical opening degree of the valve with the actual opening degree of the valve, and judging the blocking severity of the regulating valve according to the opening degree deviation result. According to the invention, by collecting real-time online operation data of the regulating valve in a normal online operation state and combining with the flow characteristic curve of the regulating valve, the severity of valve blockage is analyzed, early warning prompt can be carried out at the early stage of blockage under the condition of not influencing the normal production process of a process system, faults are found and monitored in advance, and the safety and the economical efficiency of production are improved.
Description
Technical Field
The invention relates to the technical field of monitoring of regulating valves, in particular to a regulating valve flow channel blockage online monitoring method and system.
Background
The regulating valve is a final control element which is used for changing process parameters such as medium flow, pressure, temperature, liquid level and the like by receiving a control signal output by a regulating control unit in industrial automatic process control through power operation. The regulating valve is a very critical fluid control device in the process system, and controls parameters such as temperature, pressure, liquid level and the like of the process system by regulating flow, such as a main water supply regulating valve, a pressure stabilizer spray valve and the like, the operation reliability of the regulating valve is directly related to the safe and reliable operation of the process system, and if the regulating valve fails, serious economic loss and safety accidents can be brought.
The flow capacity is an important performance index of the regulating valve, and the effective flow area of the regulating valve is adjusted by adjusting the opening of the valve, so that the flow capacity is regulated. The flow capacity of the regulating valve is usually characterized by a flow characteristic curve, and in order to achieve or realize a required flow characteristic curve, especially under the condition of large pressure difference, the regulating valve needs to adopt valve internal part designs such as small holes, honeycomb small holes, labyrinth type and the like shown in fig. 1, and on the basis, the regulating valve is easy to block due to small flow channels and the condition of unclean media.
The blockage of the regulating valve can cause the flow capacity of the regulating valve to be reduced, further cause the pressure drop of a process system to be increased, the opening degree of the regulating valve to be increased, even cause the regulating valve to be fully opened, the flow capacity requirement of the process system still cannot be met, and the blockage of the regulating valve is one of typical faults of the regulating valve.
The concept of the use of the early regulating valves was to operate the regulating valve as long as possible and to repair the regulating valve immediately in case of a failure to restore the normal operation of the valve. However, there are two significant problems with this approach, namely:
(1) The regulating valve needs to be frequently disassembled and disassembled, and damaged parts are inspected, maintained or replaced, so that time and labor are wasted;
(2) The blockage fault of the regulating valve cannot be pre-judged, particularly the regulating valve related to safety is very likely to have a fault in a short time after shutdown and overhaul, so that shutdown is caused, and meanwhile, the running state of the regulating valve cannot be acquired, so that related personnel are in an extremely passive state in the operation and maintenance of the regulating valve.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides an on-line monitoring method and system for the blockage of a flow passage of a regulating valve, which are characterized in that real-time on-line operation data of the regulating valve in a normal on-line operation state are collected, the theoretical opening degree of the valve is analyzed by combining with a flow characteristic curve of the regulating valve, the severity degree of the blockage of the valve is judged by comparing the actual opening degree with the theoretical opening degree, early warning prompt can be carried out at the early stage of the blockage under the condition of not influencing the normal production process of a process system, and a tracking fault is discovered and monitored in advance, so that the operation and maintenance of the regulating valve are more targeted, the cost is greatly saved, the efficiency is improved, and the safety and the economy of production are improved.
In a first aspect, the present disclosure provides an online monitoring method for flow channel blockage of a regulating valve, including:
collecting upstream pressure, downstream pressure, fluid medium flow, fluid medium temperature and actual valve opening of the regulating valve in an online operation state of the regulating valve;
based on the acquired data, calculating and obtaining the required circulation capacity under the current working condition according to a flow equation;
according to the required flow capacity, the theoretical opening degree of the regulating valve is obtained by combining the flow characteristic curve of the regulating valve;
and comparing the theoretical opening degree of the valve with the actual opening degree of the valve, and judging the blocking severity of the regulating valve according to the opening degree deviation result.
According to a further technical scheme, the acquisition of the demand circulation capacity comprises the following steps:
judging the type of the fluid medium of the regulating valve; the fluid medium comprises a liquid medium and a gaseous medium;
judging the state of the fluid medium; the state of the fluid medium includes a critical flow and a subcritical flow;
and respectively calculating the required circulation capacity of different fluid medium types and different fluid medium states according to the difference of the fluid medium types and the states.
According to the further technical scheme, when the fluid medium is a liquid medium, the state of the liquid medium is judged:
when in use
Judging the state of the liquid medium as critical flow; when +>
Judging the state of the liquid medium as subcritical flow;
when the liquid medium state is critical flow, the liquid medium state is determined by the formula
Calculating the demand circulation capacity; when the liquid medium state is subcritical flow, is determined by the formula->
Calculating the demand circulation capacity;
wherein the content of the first and second substances,
P V is the thermodynamic critical pressure, P C Is the saturated vapor pressure at temperature when the fluid flows, C f Is a critical flow coefficient, G f Is the specific gravity of liquid at normal temperature, Q is the volume flow of fluid medium, P 1 To regulate the upstream pressure of the valve, P 2 For adjustingPressure downstream of the throttle valve, Δ P = P 1 -P 2 Representing the pressure difference between the upstream and downstream pressures of the regulator valve.
According to the further technical scheme, when the fluid medium is a gas medium, the state of the gas medium is judged:
when in use
When the status of the gas medium is judged to be critical, when ^ is greater than or equal to ^>
Judging the state of the gas medium to be subcritical flow;
when the state of the gas medium is critical flow, the gas medium is processed by the formula
Calculating the demand circulation capacity; when the gas medium state is subcritical flow, is determined by the formula>
Calculating the demand circulation capacity;
wherein, C f Is the critical flow coefficient, and the flow rate,
G g is the specific gravity of the gas at the flow temperature, G is the specific gravity of the gas in the standard state, T is the medium temperature, W is the mass flow of the fluid medium, P 1 To regulate the upstream pressure of the valve, P 2 To regulate the valve downstream pressure, Δ P = P 1 -P 2 Representing the pressure difference between the upstream and downstream pressures of the regulator valve.
According to the further technical scheme, the calculated required circulation capacity is substituted into the flow characteristic curve of the regulating valve, and the theoretical opening degree of the regulating valve is obtained.
Calculating a valve opening deviation value, and taking a difference value between the actual valve opening and the theoretical valve opening as an opening deviation;
setting the first threshold value to be 5%, and judging that the valve is blocked when the opening deviation is greater than the first threshold value;
setting a second threshold value to be 10%, and when the opening deviation is greater than the second threshold value, judging that the valve is moderately blocked;
the third threshold value is set to be 20%, and when the opening deviation is larger than the third threshold value, the valve is judged to be severely blocked.
In a second aspect, the present disclosure provides an online monitoring system for flow channel blockage of a regulating valve, comprising:
the data acquisition module is used for acquiring the upstream pressure, the downstream pressure, the flow of the fluid medium, the temperature of the fluid medium and the actual opening of the valve of the regulating valve in the online running state of the regulating valve;
the data processing module is used for calculating and obtaining the required circulation capacity under the current working condition according to a flow equation based on the acquired data; according to the required flow capacity, the theoretical opening degree of the regulating valve is obtained by combining the flow characteristic curve of the regulating valve;
and the blockage degree judging module is used for comparing the theoretical opening degree of the valve with the actual opening degree of the valve of the regulating valve and judging the blockage severity of the regulating valve according to the opening degree deviation result.
In a third aspect, the present disclosure also provides an electronic device comprising a memory and a processor, and computer instructions stored on the memory and executed on the processor, wherein the computer instructions, when executed by the processor, perform the steps of the method of the first aspect.
In a fourth aspect, the present disclosure also provides a computer-readable storage medium for storing computer instructions which, when executed by a processor, perform the steps of the method of the first aspect.
The above one or more technical solutions have the following beneficial effects:
1. the invention provides an on-line monitoring method and a system for the blockage of a flow passage of an adjusting valve, which are characterized in that real-time on-line operation data of the adjusting valve in a normal on-line operation state are acquired, the theoretical opening degree of the valve is analyzed by combining with the flow characteristic curve of the adjusting valve, the severity degree of the blockage of the valve is judged by comparing the actual opening degree with the theoretical opening degree, the severity degree of the blockage of the adjusting valve can be found and judged under the condition of not influencing the normal production process of a process system, early warning prompt is carried out at the early stage of the blockage, the tracking fault is found and monitored in advance, and the safety and the reliability of the production process are ensured.
2. The method and the system provided by the invention have the advantages that the regulating valve is monitored and diagnosed, the relevant parameters of the mechanical, pneumatic and process systems of the valve are collected, the parameters are analyzed, the aging trend, the fault, the reason and the like of the regulating valve are given, the maintenance work of the regulating valve is guided, the operation and the maintenance of the regulating valve are more targeted, the cost is greatly saved, the efficiency is improved, and the safety and the economy of production are also improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a prior art regulator valve using orifice, honeycomb orifice, labyrinth valve trim designs;
FIG. 2 is an overall flow chart of the method for monitoring the flow channel blockage of the regulating valve on line according to the embodiment of the invention;
FIG. 3 is a schematic structural diagram of on-line monitoring of a regulating valve in the embodiment of the invention;
FIG. 4 is a schematic view of a flow characteristic curve of the regulator valve;
FIG. 5 is a schematic diagram of online monitoring of the blockage of the regulating valve in the embodiment of the invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
Aiming at the problems that the blockage fault of the regulating valve in the conventional process system cannot be diagnosed in advance in the normal production process and the blockage severity of the regulating valve cannot be judged, the embodiment provides the online monitoring method for the flow channel blockage of the regulating valve, under the condition that the normal production process of the process system is not influenced, relevant real-time online running data of the regulating valve is collected, the blockage condition of the flow channel of the regulating valve is calculated and analyzed, early warning prompt is carried out at the early stage of blockage, the fault is found and monitored and tracked in advance, and the safety and reliability of the production process are ensured.
In the method for monitoring the flow channel blockage of the regulating valve in the process system, when the regulating valve in the process system is in a normal online operation state, the upstream pressure P1, the downstream pressure P2, the flow rate (Q or W) of the fluid medium and the temperature T of the downstream fluid medium of the regulating valve are collected, and the required flow capacity C under the current working condition is calculated according to a flow equation V And calculating the corresponding theoretical opening of the valve according to the flow characteristic curve of the regulating valve, acquiring the actual opening L of the valve of the regulating valve, comparing the actual opening with the theoretical opening, and judging the severity of the valve blockage according to the deviation condition. As shown in fig. 2, the method specifically includes the following steps:
s1, collecting upstream pressure, downstream pressure, fluid medium flow, fluid medium temperature and actual valve opening of a regulating valve in an online running state of the regulating valve;
s2, calculating and obtaining the required circulation capacity under the current working condition according to a flow equation based on the acquired data;
s3, acquiring the theoretical opening degree of the regulating valve by combining the flow characteristic curve of the regulating valve according to the required flow capacity;
and S4, comparing the theoretical opening of the valve with the actual opening of the valve, and judging the blockage severity of the regulating valve according to the opening deviation result.
In the step S1, as shown in fig. 3, the regulating valve to be measured in the process system is in an online operating state, and a temperature transmitter, a flow transmitter, and a pressure transmitter are sequentially disposed at the upstream of the regulating valve, and are respectively used for acquiring the fluid medium temperature T, the fluid medium flow (Q or W), and the upstream pressure P of the regulating valve 1 Another pressure transmitter is arranged at the downstream of the regulating valve and is used for collecting the downstream pressure P of the regulating valve 2 And in addition, a valve position transmitter is arranged on the regulating valve and used for acquiring the actual opening L information of the regulating valve.
The transmitter collects the upstream pressure, the downstream pressure, the flow of the fluid medium, the temperature of the fluid medium and the actual opening degree of the valve of the regulating valve, uploads the collected data information to the data processing module, and calculates and analyzes the blocking condition of the flow channel of the regulating valve. In addition, the real-time relevant information of governing valve that the storage was gathered is convenient for subsequent data and is transferred and look over.
In the step S2, the fluid medium temperature T, the fluid medium flow Q or W and the upstream pressure P are collected 1 And downstream pressure P 2 Calculating and obtaining the required circulation capacity C under the current working condition according to a flow equation V . In the present embodiment, the fluid medium passing through the regulating valve includes a medium such as liquid or gas.
And judging the type of the fluid medium of the regulating valve, and calculating the required flow capacity under the current working condition based on the data when the fluid medium is a liquid medium. Firstly, the state of the fluid medium is judged, namely, the state of the fluid medium is judged to be critical flow or subcritical flow when
When the status of the liquid medium is critical, when->
Then, the liquid medium state is judged as subcritical flow. Secondly, respectively calculating the required circulation capacity under different fluid medium states according to the different fluid medium states, and when the liquid is in a liquid stateWhen the medium status is critical stream, based on formula>
Calculating the demand circulation capacity at the moment; when the liquid medium state is subcritical, is evaluated by the formula>
The demand circulation capability at this time is calculated.
When the fluid medium is a gas medium, the required flow capacity under the current working condition is calculated based on the data. Firstly, judging the state of fluid medium, namely judging the state of gas medium as critical flow or subcritical flow when
When the status of the gas medium is judged to be critical, when ^ is greater than or equal to ^>
Then, the state of the gas medium is judged as subcritical flow. Secondly, respectively calculating the required circulation capacity under different fluid medium states according to the difference of the fluid medium states, and when the gas medium state is a critical flow, determining whether the gas medium state is a critical flow or not through a formula->
Calculating the demand circulation capacity at the moment; when the gas medium state is subcritical flow, is determined by the formula>
The demand circulation capability at this time is calculated.
Wherein, the first and the second end of the pipe are connected with each other,
P V is the thermodynamic critical pressure (unit bar,1bar = 0.1MPa), P C Is the saturated vapor pressure (bar unit) at the temperature when the fluid flows, C f Is a critical flow coefficient, G f Is the specific gravity of liquid at normal temperature (the specific gravity of water at normal temperature is 1), G g Is qiThe specific gravity of the fluid at the flow temperature,. Beta.>
G is the specific gravity of the gas in the standard state (1.0 for air), T is the medium temperature (unit C.), and Q is the volume flow rate (unit m) of the fluid medium 3 W is the mass flow rate of the fluid medium (unit kg/h), P 1 For regulating the upstream pressure (in bar), P 2 Downstream pressure (in bar) of the regulator valve Δ P = P 1 -P 2 (in bar) represents the difference between the pressure upstream and the pressure downstream of the regulating valve.
Calculating to obtain the required circulation capacity under the current working condition through the step S2, and performing the step S3 on the basis that the calculated required circulation capacity is substituted into the flow characteristic curve of the regulating valve to obtain the theoretical opening L of the regulating valve 0 . The flow rate characteristic curve of the control valve is a curve representing the intrinsic characteristics of the control valve with the theoretical valve opening degree as the abscissa and the flow rate as the ordinate, and is known. Substituting the calculated required flow capacity into the flow characteristic curve of the regulating valve, as shown in fig. 4, when the calculated required flow capacity C V The theoretical opening L of the valve is 8.12, and the corresponding regulating valve 0 The content was 90%.
In the above step S4, the theoretical valve opening L of the regulating valve is compared 0 And the actual valve opening L, judging the severity of the blockage of the regulating valve according to the opening deviation result, namely calculating the valve opening deviation delta L = L-L 0 When the opening degree deviation Δ L reaches a certain degree, in this embodiment, the first threshold value is set to 5%, and when the opening degree deviation is greater than the first threshold value, it is determined that the valve is blocked; when the opening difference value is further increased, setting a second threshold value to be 10%, and when the opening deviation is greater than the second threshold value, judging that the valve is moderately blocked; and when the opening difference value is further increased, setting the third threshold value to be 20%, and when the opening deviation is greater than the third threshold value, judging that the valve is heavily blocked.
As another implementation manner, the method in this embodiment further includes: and carrying out early warning prompts of different levels according to the judged severity of the blockage of the regulating valve. When the valve is judged to be blocked, displaying yellow through an indicator lamp to perform early warning prompt; when the valve is judged to be moderately blocked, the early warning prompt is carried out by displaying red through the indicating lamp; when the valve is judged to be severely blocked, the red color is displayed by the indicating lamp and the alarming sound is sent out simultaneously to carry out early warning prompt. Through this scheme, can remind staff or relevant personnel regulating valve's jam condition, be convenient for discover the regulating valve jam trouble in advance, ensure production process safe and reliable.
As another implementation, the method in this embodiment further includes: the opening deviation value acquired in real time is displayed through the display module, and as shown in fig. 5, the blocking condition of the regulating valve is monitored in real time on line.
That is to say, the above-mentioned scheme of this embodiment can discover and judge governing valve jam severity under the condition that does not influence normal production process, carries out early warning suggestion in the jam initial stage, discovers and monitors the tracking fault earlier on, ensures production process safe and reliable.
According to the method, the regulating valve is monitored and diagnosed, relevant parameters of mechanical, pneumatic and process systems of the valve are collected, the parameters are analyzed, the aging trend, faults, reasons and the like of the regulating valve are given out, the maintenance work of the regulating valve is guided, the operation and maintenance of the regulating valve are more targeted, the cost is greatly saved, the efficiency is improved, and meanwhile the safety and the economy of production are improved.
Example two
The embodiment provides a governing valve runner blocks up on-line monitoring system, includes:
the data acquisition module is used for acquiring the upstream pressure, the downstream pressure, the flow of the fluid medium, the temperature of the fluid medium and the actual opening of the valve of the regulating valve in the online running state of the regulating valve;
the data processing module is used for calculating and obtaining the required circulation capacity under the current working condition according to a flow equation based on the acquired data; according to the required flow capacity, the theoretical opening degree of the regulating valve is obtained by combining the flow characteristic curve of the regulating valve;
and the blockage degree judging module is used for comparing the theoretical opening degree of the valve with the actual opening degree of the valve of the regulating valve and judging the blockage severity of the regulating valve according to the opening degree deviation result.
The data acquisition module comprises a temperature transmitter, a flow transmitter and a pressure transmitter which are sequentially arranged at the upper part of the regulating valve, another pressure transmitter arranged at the lower part of the regulating valve and a valve position transmitter arranged on the regulating valve. Specifically, a regulating valve to be measured in the process system is in an online running state, and a temperature transmitter, a flow transmitter and a pressure transmitter are sequentially arranged at the upstream of the regulating valve and are respectively used for acquiring the fluid medium temperature T, the fluid medium flow (Q or W) and the upstream pressure P of the regulating valve 1 Another pressure transmitter is arranged at the downstream of the regulating valve and is used for collecting the downstream pressure P of the regulating valve 2 In addition, a valve position transmitter is arranged on the regulating valve and used for acquiring the actual opening L information of the regulating valve. Furthermore, the data acquisition module also has a data storage function and is used for storing the acquired real-time relevant information of the regulating valve.
As another embodiment, the system for monitoring the blockage of the flow channel of the regulating valve on line further comprises a display module, wherein the display module comprises a display screen or a display panel and the like, and is used for displaying the opening deviation value acquired in real time, so that the staff or related staff can acquire the opening information of the regulating valve in real time and monitor the blockage condition of the regulating valve on line in real time.
EXAMPLE III
The embodiment provides an electronic device, which comprises a memory, a processor and computer instructions stored in the memory and executed on the processor, wherein the computer instructions are executed by the processor to complete the steps of the online monitoring method for the blockage of the flow passage of the regulating valve.
Example four
The present embodiment also provides a computer readable storage medium for storing computer instructions, which when executed by a processor, perform the steps of the online monitoring method for the blockage of the flow channel of the regulating valve.
The steps involved in the second to fourth embodiments correspond to the first embodiment of the method, and the detailed description thereof can be found in the relevant description of the first embodiment. The term "computer-readable storage medium" should be taken to include a single medium or multiple media containing one or more sets of instructions; it should also be understood to include any medium that is capable of storing, encoding or carrying a set of instructions for execution by a processor and that cause the processor to perform any of the methods of the present invention.
Those skilled in the art will appreciate that the modules or steps of the present invention described above can be implemented using general purpose computer means, or alternatively, they can be implemented using program code that is executable by computing means, such that they are stored in memory means for execution by the computing means, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps of them are fabricated into a single integrated circuit module. The present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive changes in the technical solutions of the present invention.
Claims (10)
1. An on-line monitoring method for the blockage of a flow passage of a regulating valve is characterized by comprising the following steps:
collecting upstream pressure, downstream pressure, fluid medium flow, fluid medium temperature and actual valve opening of the regulating valve in an online operation state of the regulating valve;
calculating and obtaining the required circulation capacity under the current working condition according to a flow equation based on the acquired data;
according to the required flow capacity, the theoretical opening degree of the regulating valve is obtained by combining the flow characteristic curve of the regulating valve;
and comparing the theoretical opening of the valve with the actual opening of the valve, and judging the blockage severity of the regulating valve according to the opening deviation result.
2. The method for on-line monitoring the blockage of the flow passage of the regulating valve as claimed in claim 1, wherein the obtaining of the required flow capacity comprises the following steps:
judging the type of the fluid medium of the regulating valve; the fluid medium comprises a liquid medium and a gas medium;
judging the state of the fluid medium; the state of the fluid medium comprises critical flow and subcritical flow;
and respectively calculating the required circulation capacity of different fluid medium types and different fluid medium states according to the difference of the fluid medium types and the states.
3. The method for on-line monitoring the flow channel blockage of the regulating valve as claimed in claim 2, wherein when the fluid medium is a liquid medium, the state of the liquid medium is judged as follows:
when in use
Judging the state of the liquid medium to be critical flow; when/is>
Judging the state of the liquid medium as subcritical flow;
when the liquid medium state is critical flow, the liquid medium state is determined by the formula
Calculating the demand circulation capacity; when the liquid medium state is subcritical, is evaluated by the formula>
Calculating the demand circulation capacity;
wherein, the first and the second end of the pipe are connected with each other,
P V is the thermodynamic critical pressure, P C Is the saturated vapor pressure at temperature when the fluid flows, C f Is a critical flow coefficient, G f Is the specific gravity of liquid at normal temperature, Q is the volume flow of fluid medium, P 1 To regulate the upstream pressure of the valve, P 2 To regulate the valve downstream pressure, Δ P = P 1 -P 2 Representing the pressure differential between the pressure upstream and the pressure downstream of the regulator valve.
4. The method for on-line monitoring the flow channel blockage of the regulating valve as claimed in claim 2, wherein when the fluid medium is a gas medium, the state of the gas medium is judged as follows:
when in use
When the status of the gaseous medium is critical, when->
Judging the state of the gas medium to be subcritical flow;
when the gas medium state is critical flow, the gas medium state is determined by the formula
Calculating the demand circulation capacity; when the gas medium state is subcritical flow, is determined by the formula>
Calculating the demand circulation capacity;
wherein, C f Is the critical flow coefficient, and the flow rate,
G g is the specific gravity of the gas at the flow temperature, G is the specific gravity of the gas in the standard state, T is the medium temperature, W is the mass flow of the fluid medium, P 1 To regulate the upstream pressure, P 2 To regulate the valve downstream pressure, Δ P = P 1 -P 2 Representing the pressure difference between the upstream and downstream pressures of the regulator valve.
5. The method for on-line monitoring the flow channel blockage of the regulating valve as claimed in claim 1, wherein the step of obtaining the theoretical opening degree of the regulating valve by combining the flow characteristic curve of the regulating valve according to the required flow capacity comprises the following steps:
and substituting the calculated required circulation capacity into the flow characteristic curve of the regulating valve to obtain the theoretical opening degree of the regulating valve.
6. The method for on-line monitoring the flow channel blockage of the regulating valve according to claim 1, wherein a valve opening deviation value is calculated, and the difference value between the actual opening of the valve and the theoretical opening of the valve is taken as the opening deviation;
setting the first threshold value to be 5%, and judging that the valve is blocked when the opening deviation is greater than the first threshold value;
setting a second threshold value to be 10%, and when the opening deviation is greater than the second threshold value, judging that the valve is moderately blocked;
and setting the third threshold value to be 20%, and judging that the valve is severely blocked when the opening deviation is greater than the third threshold value.
7. The utility model provides a governing valve runner blocks up on-line monitoring system which characterized by includes:
the data acquisition module is used for acquiring the upstream pressure, the downstream pressure, the flow of the fluid medium, the temperature of the fluid medium and the actual opening of the valve of the regulating valve in the online running state of the regulating valve;
the data processing module is used for calculating and obtaining the required circulation capacity under the current working condition according to a flow equation based on the acquired data; according to the required flow capacity, the theoretical opening degree of the regulating valve is obtained by combining the flow characteristic curve of the regulating valve;
and the blockage degree judging module is used for comparing the theoretical opening degree of the valve with the actual opening degree of the valve of the regulating valve and judging the blockage severity of the regulating valve according to the opening degree deviation result.
8. The system for on-line monitoring the blockage of the flow channel of the regulating valve as claimed in claim 7, wherein the obtaining of the required flow capacity comprises the following steps:
judging the type of the fluid medium of the regulating valve; the fluid medium comprises a liquid medium and a gaseous medium;
judging the state of the fluid medium; the state of the fluid medium comprises critical flow and subcritical flow;
and respectively calculating the required circulation capacity of different fluid medium types and different fluid medium states according to the difference of the fluid medium types and the states.
9. An electronic device, characterized by: comprising a memory and a processor and computer instructions stored in the memory and executed on the processor, wherein the computer instructions, when executed by the processor, perform the steps of the method for on-line monitoring of the blockage of the flow passage of the regulating valve according to any one of claims 1 to 6.
10. A computer-readable storage medium characterized by: storing computer instructions which, when executed by a processor, carry out the steps of a method for on-line monitoring of the blockage of a flow channel of a regulating valve according to any one of claims 1 to 6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116502561A (en) * | 2023-05-16 | 2023-07-28 | 江南阀门有限公司 | Method and system for improving pressure resistance level of double-valve-group valve |
| CN117146029A (en) * | 2023-10-31 | 2023-12-01 | 江苏易恒自动化设备有限公司 | Control method and control system of BV balance blade type actuating mechanism |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116502561A (en) * | 2023-05-16 | 2023-07-28 | 江南阀门有限公司 | Method and system for improving pressure resistance level of double-valve-group valve |
| CN116502561B (en) * | 2023-05-16 | 2024-04-05 | 江南阀门有限公司 | Method and system for improving pressure resistance level of double-valve-group valve |
| CN117146029A (en) * | 2023-10-31 | 2023-12-01 | 江苏易恒自动化设备有限公司 | Control method and control system of BV balance blade type actuating mechanism |
| CN117146029B (en) * | 2023-10-31 | 2024-01-02 | 江苏易恒自动化设备有限公司 | Control method and control system of BV balance blade type actuating mechanism |
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